this stems from cultural traditions that equate marriage with social respectability

This is an important aspect that needs to change because, as you say, it creates anxiety for single people, and, even worse, makes them believe there is something wrong with them. Hopefully, we will one day reach a point where a single person who is happy with their life is treated the same way as married people.

Ask them, “Are you happy?” not “Why are you single?”

Loved it. Such a simple change that could make a huge impact.